Packing device for valve stems



Geit. 9 i923. 15476276 A. c. LnNDBLoOM PACKING DEVICE FOR VALVE STEMS Filed June 5., 1922 nmm;

Patented @et Q, l923.,

ALBERT C. LINDBLOOM, OlF CHICAGO, ILLTNOS.

PACKING DEVTCE FRI VALVE STEEMS.

application filed June 5,

To all whom t may concern Be it known that ll, ALBERT C. lLiNDBLooM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful llmprovement in Packing Devices for Valve Stems, of which the following is a specification.

This invention relates to packing devices for valve stems of automobiles and the like, and is fully described in the accompanying drawing, in which the figure shows a longitudinal section through a valve stem having the invention mounted thereon.

The embodiment is illustrated in connection with a valve 10 having a valve stein 11 slidably mounted in the casting 12 and held upon its seat 13 by means of a spring 14, which is secured in a well known manner to the lower part of the stem by means of the washer 15 and pin 16.

This valve is raised in any well known manner as by means of the valve tappet 17, which is periodically raised by means of a cam Shaft, not shown. It -will be understood :that the foregoing is Iwell .known practice in automobile construction.

ln the case of the inlet valve, the passage A is under a greater oi less degree of vacuum and when the engine is new the valve Stem 11 fits its seat fairly snugly so that only a small amount of air is per` mitted to leak therearound. As the engine is used, however, both the valve stem 11 and the hole 11a, in which it is guided, wear and as this wear increases the amount of air drawn into the passage A, around the valve stem l1, eventually becomes sufficient to disturb the mixture of air and fuel reaching the engine and cylinder.

ll have overcome this trouble by removing the valve stem 10 and placing thereon a padV of yieldable material 18, such as felt or asbestos, together with a washer 19, which is preferably made concaved or conical on its inner surface and which is pressed down upon the material 18 by a vspring 20, which is sufficiently sti1 to maintain a pressure upon the washer 19 at all operati-ve positions of the valve 10 but which is a much weaker spring than the valve spring 14C, so that it has no tendency whatever to alone raise the valve od its seat or until compressed by the valve tappet 17. y

The compression of the felt-like material 18 squeezes it about the valve stem 11 so 1922. Serial No. 565,832.

as to greatly retard the tendency for air to flow around the valve stem, This action is increased by making the interfaces of the washer 19 concaved or conical.

This construction may be used upon either the inlet or exhaust valves. `When used upon the exhaust valves, however, a non-combustible material, such as asbestos, must be used for packing.

While I' have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modi fications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible in view of the prior art.

What l claim as new and desire to secure by Letters Patent, is:

1. Means for packing the valve stems of internal combustion engines comprising a felt like material adapted to surround said valve stem within the intake passage of the engine and a spring adapted to extend between the valve and said material for coinpressing the material about said valve stein.

2. Tn combination, an internal combustion engine cylinder having a valve guide, a valve having a stem slidable therein, a spring for normally holding said valve on its seat, packing surrounding .said stem` within the intake pasage of the engine and means for yieldably compressing said packing against said guide.

3. n combination, an internal combustion engine cylinder having a valve guide, a valve having a stein slidable therein, a spring for normally holding said valve on its seat, packing surrounding said stem, within .the intake passage of the engine and a spring for compressing said packing against said guide.

4. ln combination, an internal combustion engine cylinder having a valve guide, a valve having a stem slidable therein, a spring for normally holding said yalve on its seat, packing surrounding said Stem. within the intake passage of the engine and a spring weaker than the rst mentioned spring surrounding said stein, one end of said 'weaker spring engaging the valu: while the other compresses the packing about said stem..

5. In combination, an internal combustion engine cylinder having a. lvalve guide,

a valve having a stem slidable therein, a i spring for normally holding said valve on 5 its seat, packing surrounding Said stem,

within the intake passage of the engine, a dished washer rsurrounding said packing,

and a spring Wennen tno menzoned spring surroundi' g sani Smm, one end oi? said weaker spmng' engaging the while the other news upon washer to compress tno pecking nivonnd sani Siem.

C, LENEBLOM.. 

